Relay for circuit-breakers.



PATENTED OCT. 29, 1907.

M. FUSS. RELAY FOR 011101111 BREAKERS.

APPLICATION FIiIED AUG. 26-, 1904.

2 SHEETSSHBBT 1.

INJENTEJFQ Max Fuss.

PATENTED OCT. 29, 1907.

- M. FUSS.

RELAY FOR CIRCUIT BREAKERS.

APPLICATION FILED AUG.26, 1904.

' 2 SHEETS SHEBT 2.

lpk/Ez lfoa Max Fuss.

b is an L-shaped member to,

' UNITED STATliS liriTENT OFFICE. 4

MAX FUSs, OF BERLIN; emuntnr, ASSIGNOR- TO GENERAL ELECTRIC COMPANY,

I A CORPORATION OF NEW YORK.

RELAY FOR CIRCUIT-BREAKERS.

W prises novel mechanism by WlllCh thecrrcult maybe broken practically instantaneously upon an excessive overload or after a time interval upon a. slight overload, and also upon'a reversal of current.

'lhe.object and nature of my invention will more fully understood upon reference to the following description takenin connection with the accompanying drawing. and its scope will be specifically pointed out in the appended claims. K

Figures 1 and 2 of said drawing are diagrams illustrating the relay connected up in circuit with the system to be protected. the connection being somewhat different in the two figures.

Referring in detail to Fig. l,-e designates a plurality of electromagnets which constitute the stator of an induction motor whose rotor consists of a disk 0 located in operative relation thereto. In the present instance three magnets are shown, the center one of which is energized from the current transformer t included in circuit with the line' to be protected, which, in the present instance is part of a three-phase system. The

ence between the current. and voltage which exerts a pull upon the disk at tending to rotate it and a reversal of energy flow in the line will cause a reversal of flow in the center coil 0 and'a subsequent reversal in the'direciiou oi rotation of the rotor a. The disk at is connected through a train oi gearing to the contact wheel b which is adapted when rotated to close the switch k included in circuit with the trip-coil oi the switch 11- in the main line. Mounted concentrically-with the contact wheel The member to and contact wheel b are mounted loosely on the same shaft. This member is acted .upon by the tension-spring] and the adjusting screw 8. The contact wheel b is provided with aprojectionp which is adapted to engage the memher to whenever said' wheel is rotated in the direction. ind hated by the arrow M. The disk a is also provided with a damping magnet n. The switch is consists of two blades k normally resting against stops k" and each movable into engagement with the other to complete the trip coil circuit.

With this organization under normal conditions of current flow the t-orqnc of the motor will oppose the Specification of Letters Patent.- Application sna August 26.1904. BBl'lfl-l No. 222.292.

subject of the Patented Oct. 29, 1907.

pull of the spring f but will be insufficient to rotate the disk a of the motor. However, when the current exceeds the adjustedrating, the torque will prevail and the contact b will rotate the member w which'is ordinarily'drawn against the adjusting screw s by means of the spring f.- The direction of rotation of the contact wheel is indicated by the arrow M. If the excessive current continues a sufficient length of time .the righthand shoulder on :the wheel b will engage the switch I: and thereby 'close' the circuit of the tripping coil of the main switch u, thereby breaking the main circuit before .injury to the system. On the other hand, if the overload is of such short duration that'the contact wheel does not close the switch it the torque of the motor will drop off and the spring f will turn the contact wheel b case oi a change in the direction of energy flow, the direction of rotation of the magnet field will be changed and the metal disk a will rotate in the opposite direction causing a movement of the contact wheel b in the direction indicated 'by'the arrow B. Byreason of the proximity of the left-hand shoulder of the wheel b to the switch is under normal conditions, a small reverse current will be suflieient to close the switch I: and trip the main switch u.

In the system of connections shown in Fig. 2 the relay is connected up so as to operate only as an overload time limit relay; consequently the coils of the magnets c are phases Obviously the switch is may be used to control any desired circuit such as the alarm circuit shown in Fig. 2. It will also be apparent that the time limit of the relay may be easily changed by varying the ailjustment of the screw s or by changing the position of the damping magnet 11.. This adjustment is accomplished by rotating the magnet it about its pivotal support 11. and tightening the screw n upon the slotted tailpiece. 11. projecting laterally from the magnet 12. and

organization. the time interval will vary inyerselyas the overload; in other words, the greater the overload the more rapid will be the break, and this action takes place automatically. I

It will be apparent from-the above description that many changes may be made in the specific matter illus trated without departing from the spirit and scope of the invention. I therefore do not wish to be limited to the specific disclosure but aim to cover by the terms of the appended claims all such arrangements and modifications.

What I claim new and desire to secure by Letters Patent of the United States, is:

1. In an electric system, the combination of an electric circuit and a controlling device for-said circuit comprising reversible motor movable in one direction by excess enand the other parts back to their original position. In'

slotted in an arc struck from the pivot n. With this excited from current transformers t placed in different 8 5 erg) flow and in the other direction by reversal of energy" flow, and means actuated by said motor to change the con dition of said circuit 'upon a reversal and upon an excess of energy flow therein.

2. In an electricsystem, the combination of an electric circuit and a controlling device for said circuit comprising a reversible electric motor movnble in one direction by ex cess energy flow and .in.the other directionby reversal of energ flow, and' means tor. controlling said circuit actuated'by said motor u'pon a reversal and upon an excess of energy how insaid circuit.

3. In an electric system, the combination ot an electric circuit and a relay for controlling said nireuit comprising comprising an electric motor connected in thecircnit to beprotectd and rotatable in opposite directions upon reversals of energy flow in said circuit; means for opposing the rotation at said motor in one direction until the torque exceedsa definite amount, and means for changing the condition of said circuit-upon the rotation of said motor in eitherdirection. I

5. In an electric system, a relay comprising an electric motor includedin ,a circuit-to be protected and rotatable in opposite directionsupon reversals'of encrgy flowin said 'circu'ft," means for opposing the rotationot'said motor in one direction until its torqu'e exceeds a definite amount: and a switch actuated by the rotation of said motor-ii either directlom 6. In an electric system, e circnit controlling device comprising a reversible electric motor, a normally open switch and a member actuated bysni'd'motor to close said In witness whereof, I havefhereunto set my hand this fifteenth dav of Angust T1904. o

Witnesses Jr mus .lltmn mo. WoLommw IlAur'r.

7} switch upon the rotation of 'said' motor in either direction. 

